Merge pull request airbnb#150 from seekingalpha/master

Add SeekingAlpha to the README

Author: hshoff

README.md

@@ -1490,6 +1490,7 @@
   - **National Park Service**: [nationalparkservice/javascript](https://github.com/nationalparkservice/javascript)
   - **Peerby**: [Peerby/javascript](https://github.com/Peerby/javascript)
   - **Razorfish**: [razorfish/javascript-style-guide](https://github.com/razorfish/javascript-style-guide)
+  - **SeekingAlpha**: [seekingalpha/javascript-style-guide](https://github.com/seekingalpha/javascript-style-guide)
   - **REI**: [reidev/js-style-guide](https://github.com/reidev/js-style-guide)
   - **Shutterfly**: [shutterfly/javascript](https://github.com/shutterfly/javascript)
   - **Userify**: [userify/javascript](https://github.com/userify/javascript)